Re: [Xen-devel] Frag is bigger than frame.

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Apr 26, 2013 at 09:21:30AM +0100, Teck Choon Giam wrote:
> I guess those patches posted by Wei Liu are suitable for all kernels 
> regardless it is used for domU or dom0.  However the fix to address the guest 
> interface is for dom0 and that is why Wei Liu mentioned that you should be 
> able to revert your "MAX_SKB_FRAGS -> 19 hack".
> 
> Wei Liu posted those patches (few versions) few times to xen-devel mailing 
> list besides others.  I guess should be this 
> http://lists.xen.org/archives/html/xen-devel/2013-04/msg02118.html is the 
> latest for net-next.  Search xen-devel with Author "Wei Liu" you should be 
> able to get what you want.
> 

Yes, that's the final series. To apply those four fixes, you would need
to cherry-pick 3 prerequisit changesets though. Search for my name in
DaveM's net-next tree and you will see three mechanical fixes prior to
those four.


Wei.

> Thanks.
> 
> Kindest regards,
> Giam Teck Choon
> 
> 
> On Fri, Apr 26, 2013 at 12:21 PM, Steven Haigh 
> <netwiz@xxxxxxxxx<mailto:netwiz@xxxxxxxxx>> wrote:
> On 26/04/2013 1:36 AM, Wei Liu wrote:
> On Thu, Apr 25, 2013 at 4:11 PM, Wei Liu 
> <wei.liu2@xxxxxxxxxx<mailto:wei.liu2@xxxxxxxxxx>> wrote:
> On Thu, Apr 25, 2013 at 12:24:22PM +0100, Steven Haigh wrote:
> Hi all,
> 
> I've noticed a couple of DomUs have networking freeze with the following
> getting printed to the Dom0's /var/log/messages:
> 
> Apr 25 12:09:25 hosting kernel: vif vif-4-0 vif.crc: Frag is bigger than
> frame.
> Apr 25 12:09:25 hosting kernel: vif vif-4-0 vif.crc: fatal error;
> disabling device
> Apr 25 12:09:25 hosting kernel: br0: port 5(vif.crc) entered disabled state
> 
> I thought this was something to do with MAX_SKB_FRAGS - however the
> kernel I use has this increased to 19 - so in theory I shouldn't hit
> this (as far as I know).
> 
> Are there any other things that could trigger this?
> 
> 
> You're seeing a netfront bug which is fixed in that series. And it is
> not related to MAX_SKB_FRAGS but related to GSO.
> 
> Could you try applying my patch set "Bundle fixes for Xen netfront /
> netback" version 7. That series has been applied to DaveM's net-next.
> 
> 
> BTW with that series you should be able to get rid of the
> MAX_SKB_FRAGS -> 19 hack.
> 
> This could be quite difficult. The DomU kernel is RHEL based - and not easily 
> changed without sending the patch upstream to RH - which may or may not apply 
> it.
> 
> My google-fu has failed a little here - do you have a link to the patches? Is 
> it against Xen or the kernel? Further, is it something that just altering the 
> Dom0 part would resolve?
> 
> 
> --
> Steven Haigh
> 
> Email: netwiz@xxxxxxxxx<mailto:netwiz@xxxxxxxxx>
> Web: https://www.crc.id.au
> Phone: (03) 9001 6090 - 0412 935 897
> Fax: (03) 8338 0299
> 
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> 

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